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I don't understand how to use this attribute. Can anyone tell me more about it?
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LinearLayout also supports assigning a weight to individual children with the android:layout_weight attribute. This attribute assigns an "importance" value to a view in terms of how much space it should occupy on the screen. A larger weight value allows it to expand to fill any remaining space in the parent view.
Answer: Per documentation, android:weightSum defines the maximum weight sum, and is calculated as the sum of the layout_weight of all the children if not specified explicitly. Let's consider an example with a LinearLayout with horizontal orientation and 3 ImageViews inside it.
WRAP_CONTENT means that the view wants to be just large enough to fit its own internal content, taking its own padding into account.
android:gravity is used to specify how to place the content of the object within the object itself. In another word, android:gravity is used to specify the gravity of the content of the view. android:layout_gravity is an attribution the child can supply to its parent, to specify the gravity the view within its parents.
With layout_weight you can specify a size ratio between multiple views. E.g. you have a MapView and a table which should show some additional information to the map. The map should use 3/4 of the screen and table should use 1/4 of the screen. Then you will set the layout_weight of the map to 3 and the layout_weight of the table to 1.
To get it work you also have to set the height or width (depending on your orientation) to 0px.
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